Subgingival prophylaxis unit



FIG. 1 is a top perspective view of a subgingival prophylaxis unit, showing our new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a rear view thereof.

The underside of the design is not claimed.

The broken lines shown in the drawings are included for the purpose of illustrating structural environment and form no part of the claimed design. 

The ornamental design for a subgingival prophylaxis unit, as shown and described. 